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GHAIYN BOLT. No. 356,556. .Patented Jan. Z5,1887.

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EDlVAItD T. SOHOONMAKER, OF NEXV YORK, N. Y., ASSIGNOR OF ONE- THIRD TOFRANKLIN A. THURSTON, OF SAME PLACE.

CHAIN-BOLT.

SPECIFICATION forming part of Letters Patent No. 356,556, dated January25, 1887. I

Application filed November 11, 1886. Serial No. 218,532. (No model.)

To all whom, it may concern;

Be it known that I, EDWARD T. SOHOON MAKER, of the city and county ofNew York, in the State ofNew York, have invented a new and usefulImprovement in Chain-Bolts for Doors, of which the following is aspecification.

My invention relates to chain-bolts, which are most commonly applied tooutside doors, and which comprise a bolt hung by a chain and a keeper inwhich the bolt may slide, but from which the bolt cannot be disengagedwhile the door is at all open. The chain whereby the bolt is suspendedand the keeper are commonly secured to two parts of a folding door, orto the door and its jamb, and when the bolt is in the keeper but a verylimited opening of the door is permitted.

The object of my invention is to provide a keeper of such constructionthat when the bolt is simply placed in it it will slide by gravity intothe locking position in the keeper, and, furthermore, to provide meanswhereby the bolt will be caused to automatically slide into lockingengagement with its keeper when the door is closed by a person passingout or leaving the house.

I11 carrying out my invention, I employ a keeper having an inclined slotfor the bolt and a seat for the bolt offset below the lower end of theinclined slot and communicating therewith. Vhen the bolt slides down theinclined slot it drops into the seat prepared therefor,and whichprecludes any return movement of the bolt in the slot by a. pull uponthe chain. This seat for the bolt I prefer to make in the form of ablind slot below the main slot and communicating therewith at the lowerend. When the bolt slides down in the inclined main slot of the keeperit drops automatically into the lower slot, and as this lower slot isblind,or has no outlet, a pull upon the chain will simply draw'the boltinto it until it comes to a stop at the end thereof.

I prefer to construct the keeper of two members which are secured todouble doors or to a door and its casing, and which comprises aninclined slot continuous in and between the two parts. The part of thekeeper in which is formed the upper end portion of the inclined slotserves as a rest for holding the bolt when not in use, and I provide amovable stop which retains the bolt in said rest when the door is open.I also provide upon the locking portion of the keeper a cam which, whenthe door is closed, acts upon the movable stop to lift it Fig. 2'is asimilar view, representing the boltas in its position of rest in theportion of the keeper which is attached to the door carrying the bolt;and Fig. 3 is an edge view of a pore tion of the keeper whichconstitutes the rest for the bolt, and also a partial section upon aboutthe planeindicated by theirregular dotted line 50a, Fig. 1.

Similar letters of reference designate corresponding parts in all thefigures A' designates the bolt, which, as here shown, has a sphericalhead, and which is suspended by a chain, A. This chain may be attachedor hung at the point I) to the door B or to a part of the keeper, ashereinafter described. The keeper with which the bolt engages to lockthe door and prevent its opening beyond a certain point is composed oftwo parts, 0

, G, and has formed in it an inclined slot which is continuous in andbetween the two parts 0 O, and is therefore composed of two portions, DD. The portion 0 ofthe keeper is attached to the door B, which carriesthe bolt, and the chain A maybe secured to this portion of the keeper.At the top of the part D of the slot is an enlargement or opening, (Z,of sufficient size to receive the bolt directly into it, and it will beobvious that when the bolt is placed in such opening and let go it willslide downward to the position shown in Fig. 1, traversing the entirelength of the inclined main slot D D.

At the lower end of the slot portion D and below the same is a seat. D",which communicates with the slot D D, and into which the boltautomatically drops below the line of the slot D D as soon asit comes tothe lower end of said slot. As here represented, the seat D consists ofasecond slot corresponding to the slot D D, and which terminates abruptlyat the point d,it having no outlet for the bolt. I therefore term theslot D a blind slot, in asmuch as the bolt once entering it can find nooutlet, save through the entrance-channel. The bolt, descending bygravity through the slot D D, drops downward from the lower end thereofinto the blind slot or seat I), and any attempt to open the door B fromthe outside will simply draw the bolt upward into the blind slot D" inthe direction of the arrow shown in Fig. 1, and the further opening ofthe door will' therefore not be permitted. I have shown near the lowerend and at the top of the slot portion D an enlargement or opening, (1through which the bolt A may be entered into or removed from the slot DD by a person on the inner side of the door.

E designates a movable stop or latch. which is fitted to slidevertically in the part 0 of the keeper at the lower end of the slotportion I), and which projects suiiiciently into the slot portion 'D toretain the bolt therein, as is shown in Fig. 2. Vhen the bolt is out ofaction, or not in use, it is held within the slot portion D in the partO of the keeper by means of the movable stop or latch E, and the member0 of the keeper thereof forms a rest for holding the boltin its inactiveposition.

I have represented upon the part 0 of the keeper and at its extremelefthand and upper portion an inclined nose-piece or projection, e, andthe movable stop or latch E has a shoulder, e, projecting transverselyinto the path of this projection. \Vhen the door is opened the bolt A isheld within the part C of the keeper, as in a rest, and when the door isclosed by a person passing out the shoulder e of the stop or latch Ecomes in contact with the cam e, and the stop or latch is therebyraised, so as to release the bolt A and permit it to slide down throughthe slot D D into the locking position.

\Vhat I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination, with a chain-bolt, ofa keeper therefor having aninclined slot for the bolt and a seat for the bolt-offset below thelower end of the inclined slot and communicating therewith,substantially as herein described.

2. The combination, with a chain-bolt, of the keeper 0, having theinclined main slot D, provided near the lower end with the enlargement(2 for the insertion of the bolt, and the blind slot D", below the mainslot and coin municating therewith at the lower end, sub stantiallyasherein described.

3. The combination, with a chain-bolt, ot' a keeper consisting of twoparts to be secured to double doors or to a door and its casing, andwhich comprises an inclined slot continuous in and between the twoparts, the part of the keeper in which is formed the upper end portionof the inclined slot serving as a rest for holding the bolt when not inuse, and a movable stop which retains the bolt in said rest when thedoor is open, substantially as herein described.

4. The combination, with a chain-bolt, ot'a keeper made in two parts tobesecnred to a double door or a door and its casing, and which comprisesan inclined slot continuous in and between the two parts. that part ofthe keeper in which is formed the upper end portion of the slot servingas a rest for holding the bolt

